CVE-2016-8448 in Android
Summary
by MITRE
An elevation of privilege vulnerability in MediaTek components, including the thermal driver and video driver, could enable a local malicious application to execute arbitrary code within the context of the kernel. This issue is rated as High because it first requires compromising a privileged process. Product: Android. Versions: N/A. Android ID: A-31791148. References: MT-ALPS02982181.
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Analysis
by VulDB Data Team • 10/27/2022
The vulnerability identified as CVE-2016-8448 represents a critical elevation of privilege flaw within MediaTek-based Android devices, specifically affecting kernel-level components including thermal and video drivers. This vulnerability resides in the hardware abstraction layer of Android systems, where MediaTek processors integrate proprietary driver implementations that operate with kernel-level privileges. The flaw enables a local malicious application to escalate its privileges from user mode to kernel mode, thereby gaining complete control over the device's underlying system operations. The issue is particularly concerning because it leverages the inherent trust placed in system drivers, which typically operate with elevated privileges to manage hardware resources effectively.
The technical exploitation of this vulnerability stems from insufficient input validation and improper access control mechanisms within the MediaTek driver implementations. Attackers must first compromise a privileged process to establish a foothold, which aligns with the high severity rating as defined by the Common Weakness Enumeration framework under CWE-276. The kernel drivers in question fail to properly validate parameters passed from user-space applications, creating a path for malicious code injection that can execute with the highest system privileges. This type of vulnerability falls under the ATT&CK technique T1068 which describes "Exploitation for Privilege Escalation" and demonstrates how attackers can leverage system-level components to gain unauthorized access to sensitive system functions.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete system compromise capabilities. Once an attacker achieves kernel-level execution, they can manipulate system memory, modify critical system files, disable security features, and potentially install persistent backdoors. The vulnerability affects all Android devices utilizing MediaTek chipsets, making it particularly widespread given MediaTek's significant market share in mobile processors. The thermal driver component could be exploited to manipulate system cooling mechanisms, potentially causing hardware damage or creating conditions for further exploitation, while the video driver vulnerability could enable attackers to access graphics processing capabilities for more sophisticated attacks. This vulnerability demonstrates the inherent risks of proprietary driver implementations that operate outside the standard Android security model, as these components often lack the same security scrutiny applied to the main Android framework.
Mitigation strategies for CVE-2016-8448 primarily focus on software updates and system hardening measures. Device manufacturers should implement immediate security patches that address the driver validation flaws, though the effectiveness of these patches depends on the specific MediaTek chipset versions in use. System administrators and security teams should monitor for signs of exploitation attempts, particularly unusual kernel-level activities or unexpected privilege escalations. The vulnerability highlights the importance of maintaining up-to-date device firmware and operating system versions, as MediaTek typically releases security updates through device manufacturer channels rather than directly to end users. Additionally, implementing application sandboxing and privilege separation mechanisms can help limit the potential impact of such vulnerabilities by reducing the attack surface available to malicious applications. Organizations should also consider implementing behavioral monitoring systems that can detect anomalous kernel-level activities indicative of privilege escalation attempts, as these attacks often leave subtle traces that can be detected through proper system monitoring protocols.